Light is refracted when it crosses the interface from air into glass in which it moves more slowly. Since the light speed changes at the interface, the wavelength of the light must change, also. The wavelength decreases as the light enters the medium and the light wave changes direction.
Opposite to gravity is the normal force. ... The normalforce<span> is always equal in magnitude and opposite in direction to gravity. An </span>object<span> may also have friction</span>acting<span> on it. Friction is a </span>force<span> that occurs when two</span>objects<span> rub against each other, restricting or preventing motion.</span>
Answer:
si no lo entiendes dile a tu profe que te explique, de nad ;)
Explanation:
The force needed is less in water vs land because of the buoyancy in water
